It’s been a weird year. In 2017, technology spread its tentacles into our lives in ways we couldn’t have imagined—see the Equifax hack, Russia’s manipulation of Facebook, and Amazon’s purchase of everyone’s favorite overpriced supermarket. In 2018, expect the invasion to get even weirder—and more aggressive.

Artificial intelligence will touch so many of the gadgets and services we use, we won’t even realize that machines, not humans, are behind them. Hackers will continue to pursue the institutions that hold our most sensitive...